De'Longhi Portable Air Conditioner Lt — What It Means & How to Fix It
Lt on a De'Longhi Pinguino means "Low Temperature" — the frost protection has paused the unit, and it restarts by itself after defrosting.
What this code means
De'Longhi's page for the Pinguino Extreme lists Lt as "Low Temperature" (frost prevention). It explains that the appliance is fitted with a frost protection device to avoid excessive formation of ice, and that it starts up again automatically when the defrosting process is completed. Nothing has broken.
This wording comes from De'Longhi's FAQ for the Pinguino Extreme. Other Pinguino models may show a low-temperature pause differently, so check the alarm list in your manual.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Room already cool, so the coil temperature falls far enough to frost | Very common | Yes — wait |
| Restricted airflow through dirty filters | Occasional | Yes — clean the filters |
What you can try yourself
- Leave the unit plugged in and wait; it restarts automatically when defrosting is complete.
- If Lt appears often, switch the unit off, unplug it and clean the air filters.
- Avoid running cooling mode in a room that is already cold.
When to call a technician
- The unit never restarts after a long wait.
- Lt shows constantly in a warm room with clean filters.
Typical professional repair cost: Free — Lt is a normal protective pause. Persistent cases go to De'Longhi customer service.
Frequently asked questions
Is Lt a fault on a De'Longhi air conditioner?
No. De'Longhi describes it as frost prevention: the unit pauses to defrost and then starts again by itself.
How long does the Lt defrost take?
De'Longhi's FAQ gives no time. It only says the appliance restarts automatically when defrosting is completed.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related De'Longhi codes
- De'Longhi Portable Air Conditioner HL HL (or Ft) on a De'Longhi portable air conditioner means the unit is full of water and has to be drained.
- De'Longhi Portable Air Conditioner PF PF on a De'Longhi Pinguino means "Probe Failure": a probe is damaged, and De'Longhi says to contact customer service.
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